Introduce students to how to use a Venn diagram. Explain that the middle portion is for traits that both characters share, and that each outer portion is for individual character traits. Provide example from characters in another story if possible. Read a chapter from Frog and Toad Are Friends. During the story discuss the actions of each character and what personality trait those actions reflect. Students can then complete their own Venn diagram to compare frog and toad from the story.